"In the next few weeks, he will not be available for the club. It has not been established exactly how long he will be absent for."
The midfielder suffered a tear in his lateral meniscus in January and returned home to Japan for the operation. He resumed training last week and complained of more pain on Wednesday.
The 30-year-old, who is vital to Japan's hopes of making it past the group stage at the World Cup, sustained the injury in a friendly against Steaua Bucharest during the winter break.
Japan face Colombia, Greece and Ivory Coast in Group C at the World Cup.
(Reporting by Brian Homewood, editing by Ed Osmond
Reuters Messaging: brian.homewood.thomsonreuters.com@reuters.net. To sign up for our Global Sports Forum chatroom, click on https://forms.thomsonreuters.com/global_sports_forum)
(Reporting by Brian Homewood) nL3N0LX54Y
